JP3950821B2 - Manufacturing method of single-end discharge lamp - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a novel single-end discharge lamp, and more particularly to an optimum manufacturing method of a micro single-end discharge lamp.
[0002]
[Prior art]
Conventionally, single-end discharge lamps have been manufactured by the following method.
(a) Using an envelope whose apex is formed in a hemisphere and the other end is open, an exhaust pipe is connected to the hemisphere apex,
(b) An electrode mount in which a pair of electrodes are arranged in parallel is inserted into the envelope, the pair of electrodes are arranged in a hemispherical apex portion, and the power supply portion of the electrode mount is elastically contacted in the envelope. Temporarily fix the mount inside the envelope,
(c) A hemispherical apex portion is formed into a hollow spheroid while flowing an inert gas such as argon gas, and this portion is used as a light emitting portion in which a pair of electrodes are arranged side by side, and the light emitting portion The base side part of the electrode is sealed, and a metal foil constituting the power supply part of the electrode mount is embedded in the sealing part,
(d) The method of sealing the necessary filling (mercury or iodide) using the exhaust pipe, sealing the xenon gas in the light emitting section, and then sealing the root of the exhaust pipe was generally used. .
[0003]
A single-ended discharge lamp manufactured using such an exhaust pipe bursts from the connection part of the exhaust pipe with the largest residual strain due to (1) the high pressure in the light-emitting section during lighting (in this case, 60 atmospheres or more). (2) Since the thickness of the sealed part of the exhaust pipe is not uniform, the light coming out of it will be distorted, making it unsuitable as a light source for optical equipment designed based on precision optical design. (3) In addition, due to the uneven thickness, the focus of light is disturbed and the light utilization rate is reduced.
[0004]
With the increasing demand for single-ended discharge lamps, the above-mentioned disadvantages have been solved for single-ended discharge lamps, and finally a so-called chipless single-ended discharge lamp manufacturing method that does not use an exhaust pipe has been invented (Osram Patent; -186530). This method
(a) Inserting an electrode mount in which a pair of electrodes are arranged side by side into a tubular envelope with one end closed and the other end open, and arranging and arranging a pair of electrodes side by side at the closed end to be a light emitting part The temporary fixing member attached to the part is brought into elastic contact with the envelope and temporarily fixed.
(b) Filling the closed end to be the light emitting part with a necessary filler such as mercury or iodide,
(c) While the light emitting part is cooled with liquid nitrogen or the like, the whole base side of the light emitting part that becomes the sealing part is ignited and softened,
(d) The light emitting portion is formed to have a spheroid shape, and a metal foil constituting a part of the power feeding portion is embedded in a sealing portion adjacent to the light emitting portion.
[0005]
[Patent Literature]
JP-A-2-186530 (OSRAM patent)
[0006]
As a result, it has been possible to eliminate the uneven thickness of the exhaust pipe seal that has been a problem in the past (this part is also the maximum distortion), but recently, due to the dramatic evolution of precision optical instruments, The performance of chipless single-end discharge lamps manufactured by this method cannot be fully addressed. That is, recent precision optical instruments are required to further reduce the size of the light source, to make it a point light source, and to extend the service life, and in conventional chipless single-end discharge lamps, impurities enter the light emitting part during manufacture (the reason will be described later). ), Which caused the blackening phenomenon of the light emitting part and the lamp rupture, and the problem that the lamp life was reduced, and furthermore, the variation in the amount of mercury and iodide filled in the light emitting part was large, Various problems, such as variations in the brightness of the lamp, emerged along with the improvement in performance of precision optical instruments.
[0007]
In particular, miniaturization of discharge lamps due to the use of point light sources inevitably leads to a reduction in the volume of the light-emitting part, and the aforementioned variations in impurities and fillings have a large effect on lamp performance, eliminating these instability factors. However, it has been recognized that this is a major obstacle to downsizing and point light sources for chipless single-end discharge lamps.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of such conventional problems, and in particular, the development of a method capable of removing as much as possible the contamination of impurities during production into the light emitting portion during the instability factor, and the production of the method. Another object of the present invention is to provide a chipless single-end discharge lamp, particularly a chipless single-end discharge lamp that can be used for miniaturization.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is: (a) a step of forming a sealing body (10) in which a space portion serving as a light emitting portion (3) is formed at the tip ; (b) a pair of electrodes arranged side by side (1) (2) was inserted into the envelope (10) , the pair of electrodes (1) (2) were juxtaposed in the light emitting part (3 ) , connected to the electrodes (1) (2) sealing the feed portion (5) a step of temporarily fixing said electrode (1) (2) to said sealing member (10) at (6), sealing body connected to (c) emitting portion (3) (10) After heating the part, a part of the sealing part (F) is sealed to seal the power feeding part (4) (5) in the primary sealing part (6) (7) and the primary sealing part (6) A step of forming a filling material supply hole (8) communicating with the light emitting portion (3) along (7) , (d) an envelope formed with the primary sealing portion (6) (7) A step of flushing the inside of (10) with an inert gas, (e) a step of filling the light-emitting part (3) with the necessary filler (11) and a sealing gas from the filler supply through-hole (8) , (f) Close at least part of the filler supply hole (8) To process, in the manufacturing method of the single-ended discharge lamp (A) which is composed of capital, between the (c) and (d) step, said light emitting portion (3) and at 1,000 ° C. or higher envelope (10 ) Is heated at a temperature at which it does not soften .
[0010]
The invention according to claim 2 is: (a) a step of forming a sealing body (10) in which a space portion serving as a light emitting portion (3) is formed at the tip ; (b) a pair of electrodes arranged side by side ( 1) (2) is inserted into the envelope (10) , the pair of electrodes (1) (2) are juxtaposed in the light emitting part (3) , and the power supply connected to the electrodes (1) (2) A step of temporarily fixing the electrodes (1) and (2 ) in the envelope (10 ) at the portions (5) and (6) ; (c ) a sealing portion of the envelope (10) connected to the light emitting portion (3) After heating, a part of the sealing part (F) is sealed to seal the power feeding part (4) (5) in the primary sealing part (6) (7) and the primary sealing part ( 6) A step of forming a filling material supply hole (8) communicating with the light emitting portion (3) along (7) , (d) an envelope in which the primary sealing portions (6) and (7) are formed ( 10) a step of flushing the interior with an inert gas, (e) a step of filling the light-emitting part (3) with the necessary filler (11) and a sealing gas from the filler supply through-hole (8) , and (f) sealing. Cutting off the root of the body (10) , (g) filling Step of closing at least a portion of the feed hole (8), in the manufacturing method of the single-ended discharge lamp (A) which is composed of capital, the (c) and (d) during step, said light emitting portion (3) Is heated at a temperature of 1,000 ° C. or higher and the envelope (10) is not softened ”.
[0011]
In the manufacturing method of the chipless single-end discharge lamp described in the conventional example, when the filling is filled in the envelope, and further, the xenon gas is sealed, and then the base side of the light emitting portion is sealed, the sealed cylindrical seal The whole stop part is ignited from the outer periphery to soften the part, and the softened part is pinched and sealed to perform sealing. It is necessary to heat at a temperature above the softening point for a long time. By this heating, a part of the quartz glass is decomposed, and a large amount of oxygen is released into the envelope or OH groups ooze out on the inner surface of the envelope. In addition, since the tungsten electrode and the molybdenum power feeding portion temporarily fixed in the envelope are heated to the same temperature, the gas occluded in these metal portions is also released into the envelope.
[0012]
A part of these impurity gases is confined in the light emitting part in the above-described sealing operation, which causes blackening phenomenon and lamp burst as described in the conventional example. In particular, as chipless single-end discharge lamps are miniaturized and the internal volume of the light emitting part is reduced, the adverse effects of mixed impurities become obvious.
[0013]
In the present invention is contrary, in 1 Tsugifutome and during flushing step, since and the light emitting portion (3) at 1,000 ° C. or higher envelope (10) is heated to a temperature which is not softened, sealing portion Impurities emitted from (F) and the metal electrode mount (M) can be prevented from being occluded in the light emitting section (3) . In addition, the final sealing portion is a secondary sealing portion (9) which is a part of the thin filler supply through hole (8) (or the whole of the filler supply through hole (8)). The stop time (that is, the sealing heating time) can be greatly shortened. Therefore, the amount of impurities released from the envelope (10) and the metal mount (M) in the final sealing is greatly reduced, and the contamination of impurities in the light emitting part (3) is greatly reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in order according to the illustrated embodiments. FIG. 11 is a cross-sectional view of a single-end discharge lamp (A) according to the present invention. The envelope (10) has a light-emitting part (3) having a spheroidal or spherical shape or a similar shape at the tip, and the primary seal along the light-emitting part (3) on the base side of the light-emitting part (3). Stop portions (6) and (7) are formed, and are provided along the primary sealing portions (6) and (7). The filler supply through holes (8) communicated with the light emitting portion (3) A secondary sealing part (9) is formed.
[0018]
The power feeding part (4) (5) is composed of molybdenum metal foils (4a) (5a) and molybdenum external lead rods (4b) (5b), one end of which is spot welded. A pair of tungsten electrodes (1) and (2) are spot welded to the other ends of (4a) and (5a). The pair of electrodes (1) and (2) are arranged inside the light emitting section (3), and the metal foils (4a) and (5a) connected to the electrodes (1) and (2) and the vicinity thereof are It is embed | buried under the said primary sealing part (6) (7), respectively. The external lead rods (4b) and (5b) are formed by sealing an external lead member (13) bent in a U-shape as shown in FIG. The electrodes (1) and (2) used here are substantially L-shaped as can be seen from FIG. 4, and the ends of the bent ends (1a) and (2a) face each other, and the electrode base ( 1b) and 2b are arranged so as to be parallel to each other.
[0019]
In this embodiment, the filling material supply hole (8) is formed between the primary sealing portions (6) and (7), and before the secondary sealing portion (9) is formed, the light emitting portion ( As will be described later, the necessary filling material (11), xenon gas alone, or other necessary filling gas such as this is filled. After these are performed, secondary sealing is performed at any point of the filler supply through hole (8). In the illustrated embodiment, secondary sealing is performed along the base side of the light emitting part (3), and the light emitting part (3) has a spheroid approximate shape (of course, the shape of the light emitting part (3) is a spheroid). The shape is not limited to the approximate shape, but may be a spherical shape). Further, the secondary sealing does not have to be formed along the base of the light emitting part (3), and it is sufficient that the filling supply through hole (8) is closed. However, it is preferably formed along the base of the light emitting part (3) for the reason described above that the low temperature part is not formed in the light emitting part (3).
[0020]
Next, an example of the manufacturing procedure of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are drawings of a manufacturing procedure of the envelope (10) used in the present invention. While rotating the quartz glass straight tube (10a), the central portion is heated and softened, and then, as shown in FIG. Then, the roller (20) is pressed against the softened portion to gradually reduce the diameter, thereby forming a sealed body (10) having one end formed in a hemispherical shape and the other end opened as shown in FIG.
[0021]
Subsequently, the metal foil (4a) (5a) spot-welded to both ends of the external lead member (13) bent in a substantially U shape and the other end of the metal foil (4a) (5a) are spot-welded. The electrode mount (M) composed of the electrodes (1) and (2) is inserted into the envelope (10), and the pair of electrodes (1) and (2) are aligned in the closed spherical end of the envelope (10). The electrode mount (M) is placed in the envelope (10) by elastically contacting the outer lead member (13) formed slightly wider than the inner diameter of the envelope (10) to the inner surface of the envelope (10). Temporarily fix.
[0022]
When the electrode mount (M) is mounted in this way, the opening end of the envelope (10) is mounted on the exhaust stand (30) and is kept airtight by the 0 ring (31). Subsequently, the exhaust table (30) is evacuated and the inside of the envelope (10) is evacuated, and then an inert gas such as argon gas is enclosed and is heated at a temperature of 1,000 to 1,050 ° C. A necessary part is heated for a predetermined time (about 15 seconds). During this time, the exhaust of the argon gas for cleaning the inside of the envelope (10) → evacuation → the sealing of the argon gas → the exhaust of the argon gas ... the process (so-called washing or flushing process) is repeated a plurality of times. The impurities released from the metal electrode mount (M) and the quartz glass envelope (10) into the envelope (10) by the flushing are completely removed from the envelope (10).
[0023]
Thereafter, the sealing portion (F) corresponding to the metal foils (4a) and (5a) is ignited, and this portion is raised to a temperature of 2,100 ° C. or higher. At this time, the argon gas pressure in the envelope (10) is set so that the argon gas pressure is about 1 atm when heated and expanded.
[0024]
When the temperature of the sealing part (F) reaches a predetermined temperature and the heated part is in a softened state, argon gas is additionally sealed in the sealing body (10), and at the same time or immediately after this, the filling material supply hole (8) The softened and sealed portion (F) is pinched by a pair of male and female pinchers (40) and (41) in which grooves (42) and (43) for formation are respectively formed. This figure is shown in FIGS. 5 to 7, and the softened sealing portion (F) is pressed by a portion other than the grooves (42) and (43) [this portion is used as a primary pinching portion (44)], and the groove (42) Primary sealing is performed, leaving the part corresponding to (43), and the metal foil (4a) (5a) and its vicinity are embedded in the primary sealing part (6) (7) by this primary sealing. Is done. Then, as described above, the portion that matches the grooves (42) and (43) is not crushed against the pressing force at the time of pinching by the pressure of the additional sealed argon gas, and the filler supply passage that communicates with the light emitting section (3) is prevented. It remains in the sealing part as a hole (8). In other words, the light emitting part (3) formed by the primary sealing is in communication with the outside through the filling material supply hole (8).
[0025]
In addition, since intense heating for a predetermined time is applied to the sealing portion (F) even during the primary sealing, impurities are sealed from the sealing portion (F) and the metal electrode mount (M) as described above. ), But the light emitting part (3) communicates with the outside through the filler supply hole (8) as described above, and thus occurs during the primary sealing by the flushing after the primary sealing, Impurities that have entered the light emitting section (3) can be completely removed by the filler supply through hole (8).
[0026]
During the primary sealing and during the flushing step, the light emitting part (3) is heated to a temperature at which the quartz glass constituting the envelope (10) is not softened at 1,000 ° C. or higher. When the heating temperature of the light emitting part (3) is low, impurities released from the sealing part (F) and metal electrode mount (M) are occluded and accumulated in the light emitting part (3), and blackening after commercialization , It causes defects such as lamp burst or short life. In other words, the temperature of the light emitting part (3) is kept at a certain high temperature during the primary sealing and during the flushing process, and the light emitting part (3) itself is not decomposed, but the sealing part (F) or metal It is an important point of the present invention to maintain a state in which the impurities released from the electrode mount (M) are not occluded.
[0027]
After the primary sealing is performed in this manner, the necessary filling gas (11) and the necessary sealed gas such as xenon gas are sealed in the light emitting part (3) through the filling material supply hole (8) (10). Then, the base of the envelope (10) is heat-sealed and removed (FIG. 8).
[0028]
As shown in FIGS. 9 and 10, the light emitting part (3) of this semi-finished product (B) is projected outward from the shielding plate (50), and the light emitting part (3) is cooled by blowing nitrogen gas, for example, A part of the filler supply through hole (8) is ejected from a thin burner (60), and softened and blocked by a burner flame (61) such as an oxyhydrogen flame (secondary sealing). At the time of the secondary sealing, since the entire interior of the semi-finished product (B) is in a reduced pressure state, the softened part is naturally blocked by contraction. Of course, it may be pressed from the outside with a pin or the like, and the softened portion may be pushed in and closed.
[0029]
As an alternative to the above, the above-described secondary sealing portion (9) may be formed in this state without performing the above-described fundamental sealing indicated by a broken line in FIG.
[0030]
In any case, since this secondary sealing is local heating, the heating time is very short. Therefore, the amount of impurities generated from this secondary sealing part (9) is very small, as shown in the conventional example. The mixing of impurities in the light emitting part (3) is negligible. The sealing length of the secondary sealing portion (9) is sufficient to withstand the pressure increase due to gas expansion in the light emitting portion (3) when the secondary sealing portion (9) is lit. Is about 2 mm. Finally, unnecessary portions of the envelope (10) and the electrode mount (M) are cut off to obtain a finished product shown in FIG.
[0031]
FIG. 12 shows another example of the filling material supply hole (8). A thin exhaust pipe (8a) is integrally formed in the filling material supply hole (8), and the necessary filling material (11) and the necessary sealing are included. The gas is sealed in the light emitting part (3) through the exhaust pipe (8a), and the basic sealing before the secondary sealing is also performed at the root of the exhaust pipe (8a). Other points are the same as described above.
[0032]
【The invention's effect】
According to the present invention, the filler supply through hole is formed at the time of primary sealing, and the light emitting part is kept in communication with the outside, so that a large amount of impurities generated at the time of primary sealing are removed from the light emitting part. The subsequent secondary sealing can be completed in a short time because it only partially seals the thin filler supply through-hole, greatly reducing the generation of impurities in the secondary sealing. Can do. As a result, the amount of impurities mixed in the light emitting portion can be greatly suppressed, and blackening of the light emitting portion, lamp rupture, and accompanying shortening of the lifetime can be eliminated. In addition, the major feature of the present invention is that, as described above, the contamination of impurities in the light emitting part is greatly suppressed. That is.
In addition, by forming the secondary sealing portion in conformity with the shape of the base side of the light emitting unit, the shape of the base side of the light emitting unit can be a smooth curved surface, and generation of a low temperature part can be eliminated.
[Brief description of the drawings]
FIG. 1 is a front view showing a heating state of a quartz glass straight tube used in the present invention.
FIG. 2 is a front view showing a state where a softened portion of the straight pipe heated in FIG. 1 is deformed by a roller.
3 is a cross-sectional view of the one-end closed tube for a sealing body of the present invention manufactured in FIG. 2. FIG.
4 is a cross-sectional view of a state in which an electrode mount is attached to the sealing end-closed tube of FIG. 3 and is erected on an exhaust stand.
FIG. 5 is a front cross-sectional view showing a state where the sealing portion of the one-end closing tube for sealing body is primarily sealed in FIG. 4;
6 is a cross-sectional view in the direction perpendicular to FIG. 5;
7 is a cross-sectional view taken along the line XX of FIG. 5. FIG. 8 is a cross-sectional view of the semi-finished product that has been primarily sealed with a necessary filler.
FIG. 9 is a front cross-sectional view showing a secondary sealed state of a semi-finished product that is fundamentally sealed.
10 is a side sectional view in the direction perpendicular to FIG. 9;
FIG. 11 is a cross-sectional view of an ultra-compact single-ended discharge lamp formed by the method of the present invention.
12 is a cross-sectional view of another embodiment corresponding to FIG. 4. FIG.
[Explanation of symbols]
(1) (2) Electrode
(3) Light emitting part
(4) (5) Feeding part
(6) (7) Primary sealing part
(8) Filling supply hole
(9) Secondary sealing part

Claims (2)

(A) forming a sealing body in which a space part to be a light emitting part is formed at the tip;
(B) Inserting a pair of electrodes arranged side by side into the envelope, arranging the pair of electrodes in the light emitting portion side by side, and temporarily fixing the electrodes in the envelope with a power feeding portion connected to the electrodes ,
(C) After heating the sealing part of the sealing body connected to the light emitting part, part of the sealing part is sealed to seal the power feeding part in the primary sealing part and emit light along the primary sealing part. Forming a filler supply through hole communicating with the section;
(D) a step of flushing the inside of the envelope in which the primary sealing portion is formed with an inert gas;
(E) a step of filling a necessary filler into the light emitting part from the filler supply through-hole,
(F) In the method of manufacturing a single-end discharge lamp, comprising a step of closing at least a part of the filler supply through-hole,
During the steps (c) and (d), the light emitting part is heated at a temperature of 1,000 ° C. or higher and the envelope is not softened. (A) forming a sealing body in which a space part to be a light emitting part is formed at the tip;
(B) Inserting a pair of electrodes arranged side by side into the envelope, arranging the pair of electrodes in the light emitting portion side by side, and temporarily fixing the electrodes in the envelope with a power feeding portion connected to the electrodes ,
(C) After heating the sealing part of the sealing body connected to the light emitting part, part of the sealing part is sealed to seal the power feeding part in the primary sealing part and emit light along the primary sealing part. Forming a filler supply through hole communicating with the section;
(D) a step of flushing the inside of the envelope in which the primary sealing portion is formed with an inert gas;
(E) a step of filling a necessary filler into the light emitting part from the filler supply through-hole,
(F) a step of cutting off the base of the envelope;
(G) In the method for manufacturing a single-end discharge lamp, comprising a step of closing at least a part of the filling material supply hole,
During the steps (c) and (d), the light emitting part is heated at a temperature of 1,000 ° C. or higher and the envelope is not softened.

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